Paulo Neves' Photo Gallery

UUL-J7AGorceixite BaAl₃(PO₄)(PO₃OH)(OH)₆ , Fluorite CaF₂

Morro da Fumaça, Santa Catarina, Brazil

Field of View: 100 mm

CNC mine, Mantiqueira Province, Morro da Fumaça, Santa Catarina, Brazil

Gorceixite (yellow) with fluorite (purple).

Crystalline System: Monoclinic.

Genesis: nodular concretions in pseudomorphosis with fluorite (Enciclopedia dos minerais do Brasil. NEVES, P. C. P. das; ATENCIO, D. ULBRA, Canoas, p. 175, 2017).

Associated minerals at locality: baryte, fluorite, galena, kaolinite, pyrite and quartz (Enciclopedia dos minerais do Brasil. NEVES, P. C. P. das; ATENCIO, D. ULBRA, Canoas, p. 516, 2017).

Paulo Neves mineral collection CMPN0171d.

Photography: Luiz Flávio Pereira Lopez, Geoscience Institut, UFRGS, Porto Alegre, RS, Brazil.

YKN-QQLDravite NaMg₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)

São Sepé, Rio Grande do Sul, Brazil

Dimensions: 30 mm x 10 mm x 20 mm

Dravite - Bossoroca ophiolite, Southern Rio-grandense Shield, Mantiqueira Province, São Sepé, RS, Brazil.

Crystalline System: Trigonal.

Genesis: mineral that occurs in metamorphosed limestones, mafic igneous rocks, pegmatites; authigenic in sedimentary rocks (DEER et al., 1966).
Associated minerals: albite, chloritoid, chrom-spinel, chromite, gold, magnesio-hornblende, magnesite, "olivine", orthoclase, prehnite, quartz, talc, tschermakite, titanite, and zircon (MASSUDA et al., Brazilian Journal of Geoscience, v. 50, n. 4, p. e20190120-17, 2020).

Paulo Neves Mineral Collection - CMPN0142a.

Photography: Luiz Flávio Pereira Lopes - Institut of Geosciences - UFRGS, Brazil.

QKG-TA4Aragonite CaCO₃

Krallergraben, Maria Alm am Steinernen Meer, Zell am See District, Salzburg, Austria

Dimensions: 40 mm x 25 mm x 45 mm

Aragonite

Crystal System: Orthorhombic.

Genesis: karst caves, geyser deposits and hot springs; it also occurs in the ocean floor, besides being a product of alteration of serpentinites, dunites and peridotites and occurs in deposits of low temperatures and pressures in aqueous solutions (NEVES, P. C. P. das; ATENCIO, D. Enciclopedia dos minerais do Brasil - carbonatos, sulfatos e combinações orgânicas. ULBRA: Canoas, 2016, p. 77).

Associated minerals at locality: baryte and todorokite (STRASSER, A. Die Mineralen, Salzburg, 1989).

Paulo Neves Mineral Collection: CMPN n. 0327c.

Photography: Luiz Flávio Pereira Lopez, Geoscience Institut, UFRGS, RS, Brazil..

VJ7-DMFMagnesite MgCO₃

Pomba pit, Serra das Éguas, Brumado, Bahia, Brazil

Field of View: 650 mm

Cristalline System: Trigonal.

Genesis: mineral found in large continuous masses formed by hydrothermal processes, most often its source rock being dolomite. It forms predominantly by metasomatism where there is leaching by alkaline dissociations (BETEJTIN, A, Mineralogy Course. MIR, Moscow, 1977, pp. 400-401).

Associated minerals at locality: actinolite, anatase, beryl, dolomite, dravita, enstatite, kyanite, malachite, quartz, talc, and zircon (NEVES, P. C. P. das; ATENCIO, D. Enciclopédia dos minerais do Brasil - carbonatos, sulfatos e combinações orgânicas, Ed. ULBRA, Canoas, 2016, p. 294).

Geology and Mineralogy Laboratory at ULBRA, Canoas, Rio Grande do Sul, Brazil (former Pércio de Moraes Branco Mineral Collection).

Photography: Luciano Valério.

3NT-5ADLévyne-Ca (Ca,Na₂,K₂)[Al₂Si₄O₁₂]·6H₂O

Municipal quarry, Morro Reuter, Rio Grande do Sul, Brazil

Dimensions: 40 mm x 20 mm x 10 mm
Field of View: 40 mm

Municipal quarry, Serra Geral Formation, Paraná Province, Morro Reuter, Rio Grande do Sul, Brazil.

Tabular crystal inside a vesicle in basaltic rock.

Cristalline System: Trigonal.

Genesis: minerals characteristic of tonsils and crevices mainly in basic volcanic rocks and also in veins and other environments of late hydrothermal phase ((DEER, W. A.; HOWIE, R. A.; ZUSSMAN, J. An introduction to the rock forming minerals, Longmans, Green and Co. Ltd., p. 420, 1966).).

Associated minerals at locality: "amethyst", "apophyllite", "chalcedony", calcite, "chabasite", epistilbite, "heulandite", laumontite, mordenite, quartz, scolecite, and "stilbite-stellerite" (FRANK, H. T. Gênese e padrões de distribuição de minerais secundários na Formação Serra Geral (Bacia do Paraná). Porto Alegre: UFRGS, Tese (Doutorado), IG/UFRS, 2008, 322 pp.).

Luiz Englert Museum, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.

Photography: Luciano Valério.

Note: determination obtained by Powder Diffraction Data: 4.081 A (100), 2,800 A| (60), 6,690 A (24), 8, 13 (A (20, ...

2RF-T0TLeucite K(AlSi₂O₆)

Albano Laziale, Metropolitan City of Rome Capital, Lazio, Italy

Field of View: 45 mm

Leucite crystals in the matrix.

Crystalline System; Isometric.

Genesis: typical mineral of potassium-rich basic lavas, such as: leucitic basanites, leucitic tephrites, leucitic-mellitic basalts and leucitic ancaranites. It is also an essential constituent of potassium-rich ultrabasic volcanic rocks, ugandites (olivine-augite-leucite) and catungites (melilite-leucite glass with or without leucite). In some rocks, the leucite is partially or completely replaced by an intergrowth of potassium-rich K-feldspar and nepheline or surrounded by a halo consisting mainly of K-feldspar and nepheline called pseudoleucite (DEER, W. A.; HOWIE, R. A.; ZUSSMAN, J. An introduction to the rock forming minerals, Longmans, Green and Co. Ltd., p. 393, 1966).

Associated minerals at locality: "biotite", kalsilite, kaolinite, microcline, nepheline, phlogopite, quartz, and others (NEVES, P. C. P. das; ATENCIO, D. Enciclopedia dos minerais do Brasil - tectossilicatos, ULBRA, Canoas, 390 pp., 2018).

Geology and Mineralogy Laboratory, ULBRA, Canoas, Rio Grande do Sul, Brasil (former Pércio de Moraes Branco Mineral Collection)..

Photography: Luciano Valério.

6L0-80KLepidolite

Cruzeiro mine, São José da Safira, Minas Gerais, Brazil

Dimensions: 140 mm x 60 mm x 40 mm
Field of View: 140 mm

Cristalline System: Monoclinic.

Lepidolite tabular crystal showing its excellent basal cleavage according to (001)

Geology and Mineralogy Laboratory at ULBRA, Canoas, Rio Grande do Sul, Brazil (former Pércio de Moraes Branco Mineral Collection).

Photography: Luciano Valério.

8R1-Y4MLepidolite

Cruzeiro mine, São José da Safira, Minas Gerais, Brazil

Field of View: 120 mm

Cristalline System: Monoclinic.

Mica Group - mica variety rich in lithium, with appreciable Rb content. Contrary to popular belief, the pink color of lepidolite is not due to the Li content, but to the predominance of Mn over Fe2+ and the absence of Fe3+.

Genesis: typical mineral of granitic pegmatites (derives from metasomatic replacement of biotite and muscovite). It may occasionally occur in granites and aplites and in high temperature hydrothermal veins (DEER, W. A.; HOWIE, R. A.; ZUSSMANN, J. An introduction to the rock forming minerals. Longmans, Green and Co. Ltd., London, p. 242, 1966).

Associated minerals at locality: amblygonite, beryl, calcite, montebrasite, muscovite, petalite, pyrope, quartz, spodumene, and others (NEVES, P. C. P. das; ATENCIO, D. Enciclopedia dos mineras do Brasil, Solaris, São Paulo, p. 298-299, 2022).

Geology and Mineralogy Laboratory at ULBRA, Canoas, Rio Grande do Sul, Brazil (former Pércio de Moraes Branco Mineral Collection).

Photography: Luciano Valério.

W4C-FAFFulgurite

São José do Norte, Rio Grande do Sul, Brazil

Field of View: 80 mm

Fulgurite = Lechaterielite (valid name of pre-IMA since 1915).

Dunas beach, Southern Rio-grandense Coastal Plain, São José do Norte, Rio Grande do Sul, Brazil.

Cristalline System: Amorphous.

Genesis: formed by fusion of desert and beach sands with the incidence of lightning. It is also formed by high-pressure metamorphism, produced by meteorite collisions, being one of the components of tektites (SCHRAND, C. & DEUTSCH, A. Lunar Planetary Sciences, p. 1671, 1988).

Paulo Neves Mineral Collection: CMPN - 104 b.

Photography: Luciano Valério.

NJT-WDXLazulite MgAl₂(PO₄)₂(OH)₂ , Quartz SiO₂

Rapid Creek, Dawson mining district, Yukon, Canada

Field of View: 22 mm

Lazulite, Rapid Creek, Yukon, Canada.

Cristalline System: Monoclinic.

Genesis: rare mineral that occurs in rocks with a high degree of metamorphism and in pegmatites KLEIN, C.; DUTROW, B. Manual of Mineral Science, John Wiley and Sons, New York, p. 460, 2008).

Associated minerals at locality: anatase, brazilianite, fluorapatite, gorceixite, ludlamite, quartz, siderite, vivianite, wolfeite, and others (ROBINSON, G. W. et al., Mineralogy of the Rapid Creek and Big Fish River Area, Yukon Territory. The Mineralogical Record:, v. 23, n. 4 (special issue on Yukon phosphates): pp. 1-47, 1992)..

Geology and Mineralogy Laboratory at ULBRA (former Pércio de Moraes Branco Mineral Collection).

Photography: Luciano Valério.